patch "usbip: vudc: fix: Clear already_seen flag also for ep0" added to usb-next

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    usbip: vudc: fix: Clear already_seen flag also for ep0

to my usb git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-next branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release
during the merge window.

If you have any questions about this process, please let me know.


>From 3e448e13a662fb20145916636127995cbf37eb83 Mon Sep 17 00:00:00 2001
From: Krzysztof Opasiak <k.opasiak@samsung.com>
Date: Thu, 1 Dec 2016 19:14:37 +0100
Subject: usbip: vudc: fix: Clear already_seen flag also for ep0

ep_list inside gadget structure doesn't contain ep0.
It is stored separately in ep0 field.

This causes an urb hang if gadget driver decides to
delay setup handling. On host side this is visible as
timeout error when setting configuration.

This bug can be reproduced using for example any gadget
with mass storage function.

Fixes: abdb29574322 ("usbip: vudc: Add vudc_transfer")
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/usbip/vudc_transfer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/usbip/vudc_transfer.c b/drivers/usb/usbip/vudc_transfer.c
index 8b3dacc90183..4cfd475ee865 100644
--- a/drivers/usb/usbip/vudc_transfer.c
+++ b/drivers/usb/usbip/vudc_transfer.c
@@ -339,6 +339,8 @@ static void v_timer(unsigned long _vudc)
 		total = timer->frame_limit;
 	}
 
+	/* We have to clear ep0 flags separately as it's not on the list */
+	udc->ep[0].already_seen = 0;
 	list_for_each_entry(_ep, &udc->gadget.ep_list, ep_list) {
 		ep = to_vep(_ep);
 		ep->already_seen = 0;
-- 
2.10.2